fix(orders): Use WooCommerce cart for shipping calculation in order creation

## Issues Fixed:
1. ✅ Shipping cost was zero in created orders
2. ✅ Live rates (UPS, Rajaongkir) not calculated
3. ✅ Shipping title shows service level (e.g., "JNE - REG")

## Root Cause:
Order creation was manually looking up static shipping cost:
```php
$shipping_cost = $method->get_option( 'cost', 0 );
```

This doesn't work for:
- Live rate methods (UPS, FedEx, Rajaongkir)
- Service-level rates (JNE REG vs YES vs OKE)
- Dynamic pricing based on weight/destination

## Solution:
Use WooCommerce cart to calculate actual shipping cost:

```php
// Initialize cart
WC()->cart->empty_cart();
WC()->cart->add_to_cart( $product_id, $qty );

// Set shipping address
WC()->customer->set_shipping_address( $address );

// Set chosen method
WC()->session->set( 'chosen_shipping_methods', [ $method_id ] );

// Calculate
WC()->cart->calculate_shipping();
WC()->cart->calculate_totals();

// Get calculated rate
$packages = WC()->shipping()->get_packages();
$rate = $packages[0]['rates'][ $method_id ];
$cost = $rate->get_cost();
$label = $rate->get_label(); // "JNE - REG (1-2 days)"
$taxes = $rate->get_taxes();
```

## Benefits:
- ✅ Live rates calculated correctly
- ✅ Service-level labels preserved
- ✅ Shipping taxes included
- ✅ Works with all shipping plugins
- ✅ Same logic as frontend preview

## Testing:
1. Create order with UPS → Shows "UPS Ground" + correct cost
2. Create order with Rajaongkir → Shows "JNE - REG" + correct cost
3. Order detail page → Shows full service name
4. Shipping cost → Matches preview calculation

includes/Api/OrdersController.php

@@ -872,8 +872,65 @@ class OrdersController {
         ], 'shipping' );
       }
 
-      // Shipping method line (parse id:instance if provided)
+      // Shipping method - calculate using WooCommerce cart for accurate rates
       if ( $shipping_method ) {
+        // Initialize cart if needed
+        if ( ! WC()->cart ) {
+          wc_load_cart();
+        }
+        if ( ! WC()->session ) {
+          WC()->session = new \WC_Session_Handler();
+          WC()->session->init();
+        }
+        
+        // Temporarily use cart to calculate shipping
+        WC()->cart->empty_cart();
+        
+        // Add items to cart
+        foreach ( $items as $row ) {
+          $pid = absint( $row['product_id'] ?? 0 );
+          $qty = max( 1, absint( $row['qty'] ?? 1 ) );
+          if ( $pid ) {
+            WC()->cart->add_to_cart( $pid, $qty );
+          }
+        }
+        
+        // Set shipping address for calculation
+        if ( $ship_addr ) {
+          WC()->customer->set_shipping_country( $ship_addr['country'] ?? '' );
+          WC()->customer->set_shipping_state( $ship_addr['state'] ?? '' );
+          WC()->customer->set_shipping_postcode( $ship_addr['postcode'] ?? '' );
+          WC()->customer->set_shipping_city( $ship_addr['city'] ?? '' );
+          WC()->customer->set_shipping_address( $ship_addr['address_1'] ?? '' );
+        }
+        
+        // Set chosen shipping method
+        WC()->session->set( 'chosen_shipping_methods', [ $shipping_method ] );
+        
+        // Calculate shipping
+        WC()->cart->calculate_shipping();
+        WC()->cart->calculate_totals();
+        
+        // Get the calculated rate
+        $packages = WC()->shipping()->get_packages();
+        $shipping_cost = 0;
+        $shipping_title = $shipping_method;
+        $shipping_taxes = [];
+        
+        foreach ( $packages as $package ) {
+          if ( isset( $package['rates'][ $shipping_method ] ) ) {
+            $rate = $package['rates'][ $shipping_method ];
+            $shipping_cost = $rate->get_cost();
+            $shipping_title = $rate->get_label();
+            $shipping_taxes = $rate->get_taxes();
+            break;
+          }
+        }
+        
+        // Clean up cart
+        WC()->cart->empty_cart();
+        
+        // Parse method ID and instance ID
         $method_id = $shipping_method;
         $instance_id = null;
         if ( strpos( $shipping_method, ':' ) !== false ) {
@@ -881,36 +938,7 @@ class OrdersController {
           $instance_id = absint( $instance_str );
         }
         
-        // Get shipping method cost
-        $shipping_cost = 0;
-        $shipping_title = $method_id;
-        
-        if ( $instance_id ) {
-          // Get shipping zone and method instance
-          $zones = \WC_Shipping_Zones::get_zones();
-          foreach ( $zones as $zone ) {
-            foreach ( $zone['shipping_methods'] as $method ) {
-              if ( $method->id === $method_id && $method->instance_id == $instance_id ) {
-                $shipping_cost = $method->get_option( 'cost', 0 );
-                $shipping_title = $method->get_title();
-                break 2;
-              }
-            }
-          }
-          
-          // Check zone 0 (rest of the world)
-          if ( $shipping_cost == 0 ) {
-            $zone = new \WC_Shipping_Zone( 0 );
-            foreach ( $zone->get_shipping_methods() as $method ) {
-              if ( $method->id === $method_id && $method->instance_id == $instance_id ) {
-                $shipping_cost = $method->get_option( 'cost', 0 );
-                $shipping_title = $method->get_title();
-                break;
-              }
-            }
-          }
-        }
-        
+        // Add shipping line item
         $ship_item = new \WC_Order_Item_Shipping();
         $ship_item->set_method_id( $method_id );
         if ( null !== $instance_id && method_exists( $ship_item, 'set_instance_id' ) ) {
@@ -918,6 +946,12 @@ class OrdersController {
         }
         $ship_item->set_method_title( $shipping_title );
         $ship_item->set_total( $shipping_cost );
+        
+        // Set shipping taxes if available
+        if ( ! empty( $shipping_taxes ) ) {
+          $ship_item->set_taxes( [ 'total' => $shipping_taxes ] );
+        }
+        
         $order->add_item( $ship_item );
       }